Bug 13203: Plugin housekeeping: UNIMARC field 123i, 123j, 210c

Bug 13203: Plugin housekeeping: UNIMARC field 123i, 123j, 210c

In working on bug 10480, I noticed that these plugins needed some attention:

[2] unimarc_field_123i.pl: added missing template
[3] unimarc_field_123j.pl: resolved missing template with same file
[4] unimarc_field_210c_bis.pl: removed a warn, corrected some POD lines

Note about UNIMARC field 123i and 123j: Subfields $i and $j are each 8
characters long and contain the same components as subfields $f and $g
except that character position 0 contains a plus sign (for the northern
celestial hemisphere) or a minus sign (for the southern celestial hemisphere).

Test plan:
Connect unimarc_field_123i and 123j to some field.
Look especially at changing + or - for the hemisphere in the popup.
Check left-padding with zeroes for the other positions.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes tests and QA script.
Checked plugin in a UNIMARC installation.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>